J/A+A/643/A83 K2-Gaia-ESO stellar param. and abundances (Worley+, 2020)
The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars
in Gaia-ESO. The K2 Galactic Caps Project.
Worley C.C., Jofre P., Rendle B., Miglio A., Magrini L., Feuillet D.,
Gavel A., Smiljanic R., Lind K., Korn A., Gilmore G., Randich S.,
Hourihane A., Gonneau A., Francois P., Lewis J., Sacco G., Bragaglia A.,
Heiter U., Feltzing S., Bensby T., Irwin M., Gonzalez Solares E., Murphy D.,
Bayo A., Sbordone L., Zwitter T., Lanzafame A.C., Walton N., Zaggia S.,
Alfaro E.J., Morbidelli L., Sousa S., Monaco L., Carraro G., Lardo C.
<Astron. Astrophys. 643, A83 (2020)>
=2020A&A...643A..83W 2020A&A...643A..83W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, ages ; Stars, masses ; Abundances
Keywords: catalogs - stars: fundamental parameters - stars: abundances -
techniques: spectroscopic - asteroseismology
Abstract:
The extensive stellar spectroscopic datasets that are available for
studies in Galactic Archeaology thanks to, for example, the Gaia-ESO
Survey, now benefit from having a significant number of targets that
overlap with asteroseismology projects such as Kepler, K2, and CoRoT.
Combining the measurements from spectroscopy and asteroseismology
allows us to attain greater accuracy with regard to the stellar
parameters needed to characterise the stellar populations of the Milky
Way.
The aim of this Gaia-ESO Survey special project is to produce a
catalogue of self-consistent stellar parameters by combining
measurements from high- resolution spectroscopy and precision
asteroseismology.
We carried out an iterative analysis of 90 K2@Gaia-ESO red giants. The
spectroscopic values of Teff were used as input in the seismic
analysis to obtain logg values. The seismic estimates of logg were
then used to re- determine the spectroscopic values of Teff and
[Fe/H]. Only one iteration was required to obtain parameters that are
in good agreement for both methods and, thus, to obtain the final
stellar parameters. A detailed analysis of outliers was carried out to
ensure a robust determination of the parameters. The results were then
combined with Gaia DR2 data to compare the seismic log g with a
parallax-based log g and to investigate instances of variations in the
velocity and possible binaries within the dataset.
This analysis produced a high-quality catalogue of stellar parameters
for 90 red giant stars from K2@Gaia-ESO that were determined through
iterations between spectroscopy and asteroseismology. We compared the
seismic gravities with those based on Gaia parallaxes to find an
offset which is similar to other studies that have used
asteroseismology. Our catalogue also includes spectroscopic chemical
abundances and radial velocities, as well as indicators for possible
binary detections.
Description:
K2 C3 field targets were prepared as part of the Gaia-ESO observing
programme and observed in May, June and October 2016. The resulting
catalogue comprises 62 targets observed using the 580 setup of the
UVES spectrograph (blue and red arms) and 28 targets using the HR10
and HR21 setups of the GIRAFFE spectrographs on the VLT.
Stellar parameters (Teff and [Fe/H]) and chemical abundances were
determined by two Gaia-ESO nodes: Lumba (spectrum synthesis with
Spectroscopy Made Easy (SME: Valenti & Piskunov 1996A&AS..118..595V 1996A&AS..118..595V;
Piskunov & Valenti 2017A&A...597A..16P 2017A&A...597A..16P), and EPINARBO (equivalent
width analysis using DOOp: Cantat-Gaudin et al. 2014A&A...562A..10C 2014A&A...562A..10C
and FAMA: Magrini et al. 2014, MOOG Analysis, Astrophysics Source Code
Library). Both methods use MARCS stellar atmosphere models (Gustafsson
et al., 2008A&A...486..951G 2008A&A...486..951G) and the Gaia-ESO linelist (Heiter et al.,
2020, A&A, submitted). Seismic logg, as well as stellar age and mass,
were determined from the K2 detections as described in Rendle et al.
2019.
These data comprise the final K2@Gaia-ESO Catalogue of 90 Red Giants
and are presented Table B1.
The chemical abundances derived per spectral line per star per
analysis node, including the spectral line atomic information and
reference, are presented in Table B2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 600 90 K2@Gaia-ESO stellar parameters & abundances
tableb2.dat 327 50854 K2@Gaia-ESO line-by-line abundances
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- CName Gaia-ESO object name from coordinates
18- 29 A12 --- EPIC K2 unique identifier
31- 37 A7 --- Inst Instrument used for
spectroscopic observation
39- 44 F6.2 --- SNR Signal-to-noise ratio of Gaia-ESO spectrum
46- 64 I19 --- GaiaDR2 Gaia DR2 Source Identifier
66- 75 F10.7 mag Gmag Gaia DR2 G band magnitude (Vega)
77- 88 F12.8 mas Plx ?=-99 Gaia DR2 Parallax
90-102 F13.9 mas e_Plx ?=-99 Uncertainty on GAIADR2_PARAL
104-107 I4 K Teff Spectroscopic effective temperature
109-111 I3 K e_Teff Error on Teff
113-116 F4.2 [cm/s2] logg Seismic surface gravity
118-121 F4.2 [cm/s2] e_logg Error on logg
123-127 F5.2 --- [Fe/H] Spectroscopic metallicity [Fe/H]
129-132 F4.2 --- e_[Fe/H] Error on [Fe/H]
134-137 F4.2 km/s xi Spectroscopic microturbulence
139-142 F4.2 km/s e_xi Uncertainty on XI
144-151 A8 --- NodeRes Node results used for final parameters
153-159 F7.2 km/s VRgaiaDR2 ?=-99 Gaia DR2 radial velocity
161-166 F6.2 km/s e_VRgaiaDR2 ?=-99 Uncertainty on GAIADR2_VRAD
168-174 F7.2 km/s RV Radial Velocity from Gaia-ESO
176-179 F4.2 km/s e_RV Uncertainty on VRAD
181-185 F5.2 km/s vsini Rotational Velocity from Gaia-ESO
187-188 I2 --- Bin [0/1]?=-1 Binary detected? 0=no; 1=potential
190-195 F6.2 --- [NaI/Fe] ?=-99 Neutral Sodium Abundance [Na/Fe]
197-202 F6.2 --- e_[NaI/Fe] ?=-99 Uncertainty on [Na/Fe]
204-208 F5.2 --- [MgI/Fe] Neutral Magnesium Abundance [Mg/Fe]
210-213 F4.2 --- e_[MgI/Fe] Uncertainty on [Mg/Fe]
215-219 F5.2 --- [AlI/Fe] Neutral Aluminium Abundance [Al/Fe]
221-224 F4.2 --- e_[AlI/Fe] Uncertainty on [Al/Fe]
226-230 F5.2 --- [SiI/Fe] Neutral Silicon Abundance [SiI/Fe]
232-235 F4.2 --- e_[SiI/Fe] Uncertainty on [SiI/Fe]
237-242 F6.2 --- [SiII/Fe] ?=-99 Ionised Silicon Abundance [SiII/Fe]
244-249 F6.2 --- e_[SiII/Fe] ?=-99 Uncertainty on [SiII/Fe]
251-256 F6.2 --- [CaI/Fe] ?=-99 Neutral Calcium Abundance [CaI/Fe]
258-263 F6.2 --- e_[CaI/Fe] ?=-99 Uncertainty on [CaI/Fe]
265-270 F6.2 --- [CaII/Fe] ?=-99 Ionised Calcium Abundance [CaII/Fe]
272-277 F6.2 --- e_[CaII/Fe] ?=-99 Uncertainty on [CaII/Fe]
279-284 F6.2 --- [ScI/Fe] ?=-99 Neutral Scandium Abundance [ScI/Fe]
286-291 F6.2 --- e_[ScI/Fe] ?=-99 Uncertainty on [ScI/Fe]
293-297 F5.2 --- [ScII/Fe] Ionised Scandium Abundance [ScII/Fe]
299-302 F4.2 --- e_[ScII/Fe] Uncertainty on [ScII/Fe]
304-308 F5.2 --- [TiI/Fe] Neutral Titanium Abundance [TiI/Fe]
310-313 F4.2 --- e_[TiI/Fe] Uncertainty on [TiI/Fe]
315-319 F5.2 --- [TiII/Fe] Ionised Titanium Abundance [TiII/Fe]
321-324 F4.2 --- e_[TiII/Fe] Uncertainty on [TiII/Fe]
326-331 F6.2 --- [VI/Fe] ?=-99 Neutral Vanadium Abundance [VI/Fe]
333-338 F6.2 --- e_[VI/Fe] ?=-99 Uncertainty on [VI/Fe]
340-345 F6.2 --- [CrI/Fe] ?=-99 Neutral Chromium Abundance [CrI/Fe]
347-352 F6.2 --- e_[CrI/Fe] ?=-99 Uncertainty on [CrI/Fe]
354-359 F6.2 --- [CrII/Fe] ?=-99 Ionised Chromium Abundance [CrII/Fe]
361-366 F6.2 --- e_[CrII/Fe] ?=-99 Uncertainty on [CrII/Fe]
368-373 F6.2 --- [MnI/Fe] ?=-99 Neutral Manganese Abundance [MnI/Fe]
375-380 F6.2 --- e_[MnI/Fe] ?=-99 Uncertainty on [MnI/Fe]
382-386 F5.2 --- [FeI/H] Neutral Iron Abundance [FeI/H]
388-391 F4.2 --- e_[FeI/H] Uncertainty on [FeI/H]
393-397 F5.2 --- [FeII/H] Ionised Iron Abundance [FeII/H]
399-402 F4.2 --- e_[FeII/H] Uncertainty on [FeII/H]
404-408 F5.2 --- [CoI/Fe] Neutral Cobalt Arundance [CoI/Fe]
410-413 F4.2 --- e_[CoI/Fe] Uncertainty on [CoI/Fe]
415-419 F5.2 --- [NiI/Fe] Neutral Nickel Abundance [NiI/Fe]
421-424 F4.2 --- e_[NiI/Fe] Uncertainty on [NiI/Fe]
426-431 F6.2 --- [CuI/Fe] ?=-99 Neutral Copper Abundance [CuI/Fe]
433-438 F6.2 --- e_[CuI/Fe] ?=-99 Uncertainty on [CuI/Fe]
440-445 F6.2 --- [ZnI/Fe] ?=-99 Neutral Zinc Abundance [ZnI/Fe]
447-452 F6.2 --- e_[ZnI/Fe] ?=-99 Uncertainty on [ZnI/Fe]
454-459 F6.2 --- [YII/Fe] ?=-99 Ionised Yttrium Abundance [YII/Fe]
461-466 F6.2 --- e_[YII/Fe] ?=-99 Uncertainty on [YII/Fe]
468-473 F6.2 --- [ZrI/Fe] ?=-99 Neutral Zirconium Abundance [ZrI/Fe]
475-480 F6.2 --- e_[ZrI/Fe] ?=-99 Uncertainty on [ZrI/Fe]
482-487 F6.2 --- [ZrII/Fe] ?=-99 Ionised Zirconium Abundance [ZrII/Fe]
489-494 F6.2 --- e_[ZrII/Fe] ?=-99 Uncertainty on [ZrII/Fe]
496-501 F6.2 --- [BaII/Fe] ?=-99 Ionised Barium Abundance [BaII/Fe]
503-508 F6.2 --- e_[BaII/Fe] ?=-99 Uncertainty on [BaII/Fe]
510-515 F6.2 --- [LaII/Fe] ?=-99 Ionised Lanthanum Abundance [LaII/Fe]
517-522 F6.2 --- e_[LaII/Fe] ?=-99 Uncertainty on [LaII/Fe]
524-529 F6.2 --- [CeII/Fe] ?=-99 Ionised Cerium Abundance [CeII/Fe]
531-536 F6.2 --- e_[CeII/Fe] ?=-99 Uncertainty on [CeII/Fe]
538-543 F6.2 --- [NdII/Fe] ?=-99 Ionised Neodymium Abundance [NdII/Fe]
545-550 F6.2 --- e_[NdII/Fe] ?=-99 Uncertainty on [NdII/Fe]
552-557 F6.2 --- [EuII/Fe] ?=-99 Ionised Europium Abundance [EuII/Fe]
559-564 F6.2 --- e_[EuII/Fe] ?=-99 Uncertainty on [EuII/Fe]
566-573 F8.4 Msun Mass ?=-99 Seismic stellar mass
575-582 F8.4 Msun e_Mass ?=-99 Error on MASS
584-591 F8.4 Gyr Age ?=-99 Seismic stellar age
593-600 F8.4 Gyr e_Age ?=-99 Error on AGE
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Node Gaia-ESO node name
10- 25 A16 --- CName Gaia-ESO object name from coordinates
27- 33 A7 --- Inst Spectroscopic instrument
35- 43 F9.4 0.1nm Lambda Wavelength of spectral line
45- 46 A2 --- El Atomic element name
48 I1 --- Ion [1/2] Species: 1=neutral, 2=ionised
50- 55 F6.3 eV ExcPot Excitation potential
57- 68 F12.9 [-] loggf Oscillator strength
70- 75 F6.2 0.1pm EW ?=-99 Measured equivalent width
77- 86 F10.4 --- Abund Measured abundance as log(eps)
88- 97 F10.4 --- e_Abund Error on Abund
99 I1 --- l_Abund [0/1] Limit flag (1=Upper limit (1)
101-102 A2 --- MeasType [SS EW] Measurement type (2)
104-327 A224 --- Ref Atomic information reference
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Note (1): Limit flag as follows:
0 = Detection
1 = Upper limit
Note (2): Measurement type as follows:
SS = Spectrum Synthesis
EW = Equivalent Widths
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Acknowledgements:
C. Clare Worley, ccworley(at)ast.cam.ac.uk
(End) C. Clare Worley [Univ. of Cambridge], Patricia Vannier [CDS] 17-Aug-2020